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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb0f844e45e017157b6191d8ed8c4a581c8aabc5a2f0ef3c4a5bcfe39be8b8e8' 
  AND token = 'nPbSLiGjv+UNWHSvjUDq4N3u7n08praMSWcCx67ik4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}